I didn't realise that Cura already had a menu item. To prevent
Confusion, i've changed Cura.MenuItem to use UM.MenuItem and let all
other menus use Cura.MenuItem
It seems that the extra logic doesn't play well with a menu bar.
Since we don't need to make this menu invisible ever, there is no need for the
extra logic to hide it. As such we can just use the regular menu
CURA-8683
The icon existed only in the UM3NetworkPrinting plugin but it was also used in the ConfigurationItem.qml in Cura, so it had to be moved to the Cura icons.
CURA-8520
Although the ExpandablePopup already sets the anchors of the `headerItem` to account for the arrow icon on the right side, the ConfigurationMenu's extruder row was ignoring it, thus making the elided text of the last extruder to overlap with the arrow icon a bit.
This commit fixes that by explicitly accounting for the width of the arrow in the extruders row.
**Note:** if the Cura window gets resized way too much, the extruder icons will still overlap with the arrow, since there is no space to fit everything.
CURA-8496
When the labels were getting truncated and invisible after reducing the width of Cura's window, their visibility wasn't being restored back and, as a result, the `materialTypeLabel` was the only one that was remaining visible, even if there was enough space for the full `materialBrandColorTypeLabel`.
Changing the ColumnLayout to a Column, where the width is inherited from the parent, fixes that issue.
CURA-8496
Both the `preferredWidth` AND the `width` need to be set for the labels to be properly elided if there is no more room in the ColumnLayout. In addition, the ColumnLayout that contains the variants and material names needs to be visible only if width>0, otherwise when the width is negative, for some reason the `materialTypeLabel` appears again.
CURA-8496
The icon was rendered at a too small size, such that it would get a different line width or look-and-feel than the rest. However making it bigger doesn't properly centre it either.
To centre it we also reduced the margin.
Contributes to issue CURA-8202.
